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11560: Doc/Zsh/expn.yo: pipes are pipes even if plumbing isn't.

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Peter Stephenson 2000-05-24 15:20:26 +00:00
parent 53573eaffb
commit 8fd4ecc346
2 changed files with 8 additions and 4 deletions
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@ -1,3 +1,7 @@
2000-05-24 Peter Stephenson <pws@cambridgesiliconradio.com>
* 11560: Doc/Zsh/expn.yo: pipes are pipes even if plumbing isn't.
2000-05-24 Bart Schaefer <schaefer@zsh.org>
* 11554: Doc/Zsh/compsys.yo: Rearrange _arguments doc some more.

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Doc/Zsh/expn.yo
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@ -320,13 +320,13 @@ Both the tt(/dev/fd) and the named pipe implementation have drawbacks. In
the former case, some programmes may automatically close the file
descriptor in question before examining the file on the command line,
particularly if this is necessary for security reasons such as when the
programme is running setuid. In the second case, the file passed as an
argument to the command is a system pipe, so programs that expect to lseek
(see manref(lseek)(2)) on the file will not work; furthermore, if the
programme is running setuid. In the second case, if the
programme does not actually open the file the subshell attempting to read
from or write to the pipe will (in a typical implementation, different
operating systems may have different behaviour) block for ever and have to
be killed explicitly.
be killed explicitly. In both cases, the shell actually supplies the
information using a pipe, so that programmes that expect to lseek
(see manref(lseek)(2)) on the file will not work.
Also note that the previous example can be more compactly and
efficiently written (provided the tt(MULTIOS) option is set) as: